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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumConceptual

JEE Main 2 September 2020, Shift 1, Chemistry Q42

Question 42 of 75 in this shift, Chemistry question 17 of 25.

The increasing order of the following compounds towards HCN addition is : (i) 3-methoxybenzaldehyde (H3CO\mathrm{H_3CO} meta to CHO) (ii) 2-nitrobenzaldehyde (NO2\mathrm{NO_2} ortho to CHO) (iii) 2-methoxybenzaldehyde (OCH3\mathrm{OCH_3} ortho to CHO) (iv) 3-nitrobenzaldehyde (O2N\mathrm{O_2N} meta to CHO)

The figure, in words

Four substituted benzaldehydes drawn and labelled (i)-(iv): (i) H3CO and CHO meta; (ii) CHO with NO2 ortho; (iii) CHO with OCH3 ortho; (iv) O2N and CHO meta.
  1. (1)(iii) < (iv) < (i) < (ii)
  2. (2)(iii) < (i) < (iv) < (ii)Official answer
  3. (3)(i) < (iii) < (iv) < (ii)
  4. (4)(iii) < (iv) < (ii) < (i)

Official answer

Option 2

NTA final key (Sep 2020).

Chapter
Aldehydes, Ketones and Carboxylic Acids
Topic
Nucleophilic Addition
Idea tested
Aldehyde vs Ketone Reactivity

Same topic in other shifts

All Nucleophilic Addition questions
  1. 2 Apr 2026, Shift 2 · Q67A molecule (X) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q66Given below are two statements : Statement I : The condensation reaction between CH3−CH=O\mathrm{CH_3-CH=O} and H2N−NH−C(=O)−NH2\mathrm{H_2N-NH-C(=O)-NH_2}…MediumTwo statements
  3. 7 Apr 2025, Shift 2 · Q68"P" is an optically active compound with molecular formula C6H12O\mathrm{C_6H_{12}O}. When 'P' is treated with 2, 4-dinitrophenylhydrazine, it…MediumDiagram basedHas a figure
  4. 6 Apr 2024, Shift 2 · Q78Consider the given reaction, identify the major product P. CH3−COOH\mathrm{CH_3-COOH}…MediumSingle correct
  5. 31 Jan 2024, Shift 1 · Q89The product of the following reaction is P. 4-Hydroxybenzaldehyde, (i) PhMgBr (1 equiv.), (ii) aq. NH4Cl\mathrm{NH_4Cl}, gives P The number…MediumNumerical valueHas a figure
  6. 24 Jun 2022, Shift 1 · Q89Number of electrophilic centres in the given compound is ______.MediumNumerical valueHas a figure

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.